For me I forced the unmount of /dev/sda5 which is where /isodevice mounted. sudo umount -lrf /isodevice
Similar issue: https://askubuntu.com/questions/1157619/install-cannot-modify-hard-disk -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1855531 Title: Installation - partition manager is breaking To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1855531/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
